Malicious PDF — malware analysis report

Static analysis result for SHA-256 295b186f63ccb1dd…

MALICIOUS

PDF

74.7 KB Created: 2021-09-17 09:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4b0655da56249aeb99f8b7a5676df3af SHA-1: e2e7ee6abc812ea1dbbc3520110af91b64126f04 SHA-256: 295b186f63ccb1dd15e0a7c3148d898f350df811d6b4d4d8d066a4380d6eefd5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to websites hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://postelezmasivu-brno.com/ckfinder/userfiles/files/22554278862.pdf In PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf823bf185---duluvipepepixekojuxutizit.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/78848281209.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/kevobodufaxume.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/makalazuvupo.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/xifopitawawu.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/56363436274.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/4651500859.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/15323235728.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139ed95a0cdf---75435031503.pdfIn PDF document text
    • https://maria-galland.ru/files/file/vemekub.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/maxeti.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/vofesi.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/dilozegigasikuxi.pdfIn PDF document text
    • https://majubesar.info/contents/files/57864740535.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/kanido.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/161301a2e15183---bakavafer.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614270a352a76---27225747440.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/42459875787.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/28140189475.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/dodizetozudavafazun.pdfIn PDF document text
    • http://accutindustry.com/Upload/files/20210917034326.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/37696893113.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/ruzafisakiwifel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=recommended+apps+for+android+tvPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC229 16308 bytes
SHA-256: 436a6f03b2cb4e7b8b820600e332a955a7dcab9bf7caefb4475aa865c144c1ea
font_01_sfnt_off0000ec1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10431 10844 bytes
SHA-256: 89cdd0df23b77875cc4adf2e511f6fb182530680caeb1f00cb7573d57669ffc5

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